fixed lexing (syntax highlighting) of the null-character (^@) in SciTECO code

* Apparently g_utf8_get_char_validated() sometimes(!) returns -2 for null-characters,
  so it was considered an invalid byte sequence.
* What's strange and unexplainable is that other uses of the function, as are behind nA and nQq,
  did not cause problems and returned 0 for null-bytes.
* This also fixes syntax higlighting of .teco_session files which use the null-byte as the
  string terminator.
  (.teco_session files are not highlighted automatically, though.)

1 files changed, 1 insertions, 1 deletions

diff --git a/src/view.c b/src/view.c
index 1f09ce6..b8c72a5 100644
--- a/src/view.c
+++ b/src/view.c
@@ -657,7 +657,7 @@ teco_view_get_character(teco_view_t *ctx, gsize pos, gsize len)
 	 * The sign bit in UCS-4/UTF-32 is unused, so this will even
 	 * suffice if TECO_INTEGER == 32.
 	 */
-	return (gint32)g_utf8_get_char_validated(buf, -1);
+	return *buf ? (gint32)g_utf8_get_char_validated(buf, -1) : 0;
 }
 
 void